US3631358A
Expired / Lapsed
US
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Multistage-type microwave amplifier
Assignee: NEC Corp
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Filing: 1969-01-14
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Granted: 1971-12-28
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Expires: 1989-01-14
Abstract
Abstract A microwave amplifier comprising a plurality of amplifier units connected in cascade fashion. Each of the amplifier units have substantially similar gain-versus-freuqency characteristics, which characteristics are substantially flat over the entire operating frequency range. The units are connected by lines which in the microwave amplifier embodiment may be strip lines having electrical lengths which are selected in accordance with any one of a group of predetermined equations so as to provide a multistage microwave amplifier whose resultant gain-versusfrequency characteristic is likewise substantially flat over the entire operating frequency range.
Inventors
- 👤 Kazuo Ayaki
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-24 19:57
CPC Classifications
H; H03; H03F; H03F3/00; H03F3/60
Claims Analysis
Total Claims: 10
Claim 1
Independent Claim
109 words
A multistage microwave amplifier comprising n transistor amplifier stages each having substantially similar flat gain versus frequency characteristics over a predetermined portion of the microwave frequency range, wherein n is an integer equal to or greater than 3; n-1 strip lines each having a different predetermined electrical length and each being inserted between the output and input terminals of adjacent amplifier stages; said electrical lengths being selected to provide a substantially flat resultant gain versus frequency characteristic for said multistage amplifier over said predetermined portion of the microwave frequency range wherein the electrical lengths are totally independent of the input and output impedance values of the individual amplifier stages.
Claim 2
Dependent Claim
109 words
A multistage microwave amplifier comprising n transistor amplifier stages each having substantially similar flat gain versus frequency characteristics over a predetermined portion of the microwave frequency range, wherein n is an integer equal to or greater than 3; n-1 strip lines each having a different predetermined electrical length and each being inserted between the output and input terminals of adjacent amplifier stages; said electrical lengths being selected to provide a substantially flat resultant gain versus frequency characteristic for said multistage amplifier over said predetermined portion of the microwave frequency range wherein the electrical lengths are totally independent of the input and output impedance values of the individual amplifier stages.
Claim 3
Dependent Claim
80 words
A multistage high-frequency amplifier structure comprising n transistor amplifier stages eaCh having substantially equal gain versus frequency characteristics over a predetermined frequency range, wherein n is an integer equal to or greater than 3; n- 1 strip lines each having predetermined electrical lengths and each being inserted between the output and input terminals of adjacent amplifier stages; said electrical lengths being selected to provide a substantially flat resultant gain versus frequency characteristic over said frequency range for said multistage amplifier.
Claim 4
Dependent Claim
80 words
A multistage high-frequency amplifier structure comprising n transistor amplifier stages eaCh having substantially equal gain versus frequency characteristics over a predetermined frequency range, wherein n is an integer equal to or greater than 3; n- 1 strip lines each having predetermined electrical lengths and each being inserted between the output and input terminals of adjacent amplifier stages; said electrical lengths being selected to provide a substantially flat resultant gain versus frequency characteristic over said frequency range for said multistage amplifier.
Claim 5
Dependent Claim
129 words
A multiple-stage-type microwave amplifier comprising: n transistor amplifier units each having substantially equal gain versus frequency characteristics over a predetermined frequency range, wherein n is any integer equal to or greater than 3; (n- 1) transmission lines, each having electrical lengths whose phase delays are given by theta 1, theta 2, . . . theta n 1 wherein each line may have an electrical length equal to or greater than zero so as to satisfy the equation: e-j2 theta 1+e-J 2 theta 2+. . . +j2 theta n 1 0 at a frequency near the center of the frequency band being amplified, said lines being inserted one by one between each of the n unit amplifiers to provide a multistage amplifier having a substantially flat gain versus frequency characteristic.
Claim 6
Dependent Claim
129 words
A multiple-stage-type microwave amplifier comprising: n transistor amplifier units each having substantially equal gain versus frequency characteristics over a predetermined frequency range, wherein n is any integer equal to or greater than 3; (n- 1) transmission lines, each having electrical lengths whose phase delays are given by theta 1, theta 2, . . . theta n 1 wherein each line may have an electrical length equal to or greater than zero so as to satisfy the equation: e-j2 theta 1+e-J 2 theta 2+. . . +j2 theta n 1 0 at a frequency near the center of the frequency band being amplified, said lines being inserted one by one between each of the n unit amplifiers to provide a multistage amplifier having a substantially flat gain versus frequency characteristic.
Claim 7
Dependent Claim
88 words
A multistage-type microwave amplifier comprising n unit transistor amplifiers having substantially equal gain vs. frequency characteristics, where n is any integer equal to or greater than 3; (n- 1) transmission lines having electrical lengths whose phase delays are given by (where theta 0 is equal to or greater than zero) at frequency near the center of amplification band being inserted respectively one by one between the inputs and outputs of each of said unit amplifiers to provide a multistage amplifier having a substantially flat gain versus frequency characteristic.
Claim 8
Dependent Claim
88 words
A multistage-type microwave amplifier comprising n unit transistor amplifiers having substantially equal gain vs. frequency characteristics, where n is any integer equal to or greater than 3; (n- 1) transmission lines having electrical lengths whose phase delays are given by (where theta 0 is equal to or greater than zero) at frequency near the center of amplification band being inserted respectively one by one between the inputs and outputs of each of said unit amplifiers to provide a multistage amplifier having a substantially flat gain versus frequency characteristic.
Claim 9
Dependent Claim
100 words
A multistage microwave amplifier structure comprising n microwave transistor amplifier stages each having substantially flat gain versus frequency characteristics over a predetermined frequency range and each being comprised of at least one semiconductor device, wherein n is an integer equal to or greater than 3; (n- 1) transmission lines each having different predetermined electrical lengths and each being inserted between the output and input terminals of adjacent amplifier stages; said electrical lengths being selected to provide a substantially flat resultant gain versus frequency characteristic for said multistage microwave amplifier over said frequency range; said lines each being microwave strip lines.
Claim 10
Dependent Claim
100 words
A multistage microwave amplifier structure comprising n microwave transistor amplifier stages each having substantially flat gain versus frequency characteristics over a predetermined frequency range and each being comprised of at least one semiconductor device, wherein n is an integer equal to or greater than 3; (n- 1) transmission lines each having different predetermined electrical lengths and each being inserted between the output and input terminals of adjacent amplifier stages; said electrical lengths being selected to provide a substantially flat resultant gain versus frequency characteristic for said multistage microwave amplifier over said frequency range; said lines each being microwave strip lines.
References Cited (Backward Citations)
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1974-12-27 | 1975-06-28 | 1975-12-28 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1978-12-27 | 1979-06-28 | 1979-12-28 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1982-12-27 | 1983-06-28 | 1983-12-28 | $7700.00 | Window Closed / Lapsed |